Scans were preprocessed using FSL (FMRIB Software Library, www.fmrib.ox.ac.uk/fsl) and FEAT (FMRI Expert Analysis Tool) Version 6.00. Scans were motion corrected using MCFLIRT [1]}, non-brain stripping with BET [2]}, spatial smoothing using a Gaussian kernel of FWHM 6 mm, grand-mean intensity normalization of the entire 4D dataset using a single multiplicative factor, and high-pass temporal filtering (Gaussian-weighted least-squares straight line fitting, sigma = 45 s). Finally, nonlinear registration was completed to Montreal-Neurological Institute space using FNIRT [3]}, [1]}.
